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Open-Access Journal
Frontier
Hussein Hassan Okasha, Abeer Awad, Ahmed El-meligui, Reem Ezzat, Ashraf Aboubakr, Sameh AbouElenin, Ramy El-Husseiny, Ahmed Alzamzamy 
World J Gastroenterol 27(21):2664-2680. Published online Jun 7, 2021. doi: 10.3748/wjg.v27.i21.2664
Review
Michela Visani, Giorgia Acquaviva, Antonio De Leo, Viviana Sanza, Lidia Merlo, Thais Maloberti, Alba A Brandes, Enrico Franceschi, Monica Di Battista, Michele Masetti, Elio Jovine, Sirio Fiorino, Annalisa Pession, Giovanni Tallini, Dario de Biase 
World J Gastroenterol 27(21):2710-2726. Published online Jun 7, 2021. doi: 10.3748/wjg.v27.i21.2710
Minireviews
Sohan Lal Solanki, Saneya Pandrowala, Abhirup Nayak, Manish Bhandare, Reshma P Ambulkar, Shailesh V Shrikhande 
World J Gastroenterol 27(21):2758-2770. Published online Jun 7, 2021. doi: 10.3748/wjg.v27.i21.2758
Basic Study
Sarah Musa Hammoudeh, Arabella Musa Hammoudeh, Poorna Manasa Bhamidimarri, Bassam Mahboub, Rabih Halwani, Qutayba Hamid, Mohamed Rahmani, Rifat Hamoudi 
World J Gastroenterol 27(21):2850-2870. Published online Jun 7, 2021. doi: 10.3748/wjg.v27.i21.2850
Clinical and Translational Research
Retrospective Study
Deng Han, Yuan-Liang Li, Zhi-Wei Zhou, Fei Yin, Jie Chen, Fang Liu, Yan-Fen Shi, Wei Wang, Yu Zhang, Xian-Jun Yu, Jian-Ming Xu, Run-Xiang Yang, Chao Tian, Jie Luo, Huang-Ying Tan 
World J Gastroenterol 27(21):2895-2909. Published online Jun 7, 2021. doi: 10.3748/wjg.v27.i21.2895
Observational Study